Electric heater.



W. 3. HADAWAY, Jn

ELECTRIC HEATiR. 'APPucAnoea' FILED. MAY 14. m4.v

PatentedSept. 21, 1915.

2 SHEETS-SHEET I A TTOR/VEVS WIS. HADAWAY, 3R.

ELEGTRiC HEATER.

awucm'mm FILED MAY 14. 1914.

Pafent-edSept. 21, 191.5.

2 SHEETS-SHEET 24 rrnn s'rarns PATENT OFFICE.

WILLIAM S. HADAWAY, JR., OF NEW ROCHELLE, NEW YORK.

ELECTRIC HEATER.

means.

Specification of Letters Patent.

Application filed May 14, 1914. SerialNo. 838,443.

T all WJILOWL it may concern:

Be it known that I, VVILLIAM S. HADAWAY, Jr, a citizen of the UnitedStates of America, and a resident of New Rochelle, Westchester county,and State of New York, have invented. certain new and usefulImprovements in Electric Heaters, of which the following is aspecification, reference to correspond to Fig. 3, is shown on a largerscale in Fig. 4. Figs. and 6 are sectional details corresponding inscale to Fig. 4, taken respectively on the lines 5-5 and 6-6 of Fig. 1.Fig. 7 is adetail plan view of the top and auxiliary bus bars. Fig. 8 isa diagrammatic view of the resistance coils of being had to theaccompanying drawings, which the heater units are comprised and formingapart thereof.

My invention relates to electric heating appliances and particularly toair heaters or stoves such as are adapted to be used on oceansteaniships or the like.

One object of my invention is to provide a simple and durable heater ofthe aforesaid character that shall be relatively inexpensive toconstruct and have an inclosing and protecting casing by which it may besecured either to a horizontal or a vertical surface.

Another object is to provide an improved, well-balanced heater structurewhich shall embody a plurality of interchangeable heater units andcurrent conducting busbars arranged to mechanically support as well aselectrically connect the units. v Still another object is to provide aduplex heater unit that shall be specially. adapted for use withastructure having the above named characteristics and be so arrangedthat suitable electrical connections between units are automaticallyeffected when the units are bolted in position in the casing structure.

Other objects and advantages of my in-.

vention will be set forth hereinafter, and in order that my inventionmay be thoroughly understood, I will now proceed to describe the same inthe following specification and then point out the novel featuresthereof in appended claims.

Referring. to the drawings: Figure 1 is a sectional elevation looking atthe front of the device, of an. electric heating appliance arrangedandconstructed in accordance with my invention. Fig. 2 is an endelevation of the same device with the terminal boX shown in section.Fig. 3 is a transverse sectional elevation on the line 3-3 of Fig. 1. Asecwhich' they form parts.

their circuit connections.

Like characters of reference designate corresponding parts in all thefigures.

The structure illustrated comprises a pair of. spaced end members 10 and11 joined by longitudinal bus-bars 12 and 13, and a plurality ofinterchangeable heater units 25.

In addition to the end members 10 and 11 the casing comprises. a curvedsheet metal back 14 which is secured at its respective ends to flanges15 and 16 of the end mem' bers by any suitable means such as stove bolts17, and a cover member 18 which is hinge-connected to the back at 19 andis pro vided with pivoted latch bolts 20. \Ving nuts 21 are mounted onthe bolts which are arranged to cooperate in a well known manner withforked lug projections 22 of the back 14:.

The end members 10 and 11 are each provided with supports 28 havingsubstantially square body portions and foot extensions which are adaptedto rest on the floor or be secured to a vertical wall. The supports aresecured in position by bolts 24; and may be either mounted adjacent toeach other to constitute legs as shown in full lines in big. 2, orturned with their foot extensions projecting backwardly and secured onenear the top and one near the bottom of the end member as shown inbroken lines in Fig. 2. They are adapted in the latter arrangement toact as brackets by which the heater may be mounted on a vertical wall.

The bus-bars 12 and 13 are located near the central plane of the deviceand are parallel to each other, one being near the top and one near thebottom of the frame of They are secured to and insulated from theendmembers of the frame, and suitable electrical connectional detail ofone of the heater units drawn tions are established from them at one endi to a plurality of terminals 40. These ter and extend into a terminalbox 41 as shown in Fig. 1. A cable outlet .42 is also secured to the endmember 11 and opens into the terminal box. 4

Each of the heater units con'iprises a central sheet metal plate 26,resistance coil supports 2728 which are arranged in pairs and extendlaterally outward from opposite sides of the plate as clearly shown inFig. 3, and resistance coils 29 which are mounted on the supports ashereinafter explained.

As shown in detail in Fig. 3, the supports 27 are mounted in pairs andconsist of angle strips having perforated arms 30,-which are clamped tothe plate 26 on opposite sides thereof by a hollow rivet .31 but areelectrically separated therefrom and from each other by insulatingwashers 82.

Each of the supports 27 is provided at its outer end with some suitablehooked ends which, as shown, are formed by making a pair of spacednotches 3G in the outer edge of the strip and bending the resultingcentral projection 37 into a downward hook, and the end projections 38into upward hooks or vice versa.

The supports 28 are similarly formed and secured to the plate 26. Theyare however, preferably somewhat longer than the sup ports 27 andconsequently when the resistance coils, which are arranged in a zigzagmanner, are mounted on the supports they lie in planes which are c)rrespondingly inclined to the intermediate plate 26 as shown in Fi 3.

There are for each unit a pair of terminal supports 89 which correspondto the supports 27 and 28 except that instead of being provided with thehooked extensions they have a terminal bolt 3?). Adjacent to each of thesupports 39, which are located at two of the. corners of the unit, is aconducting strip which extends upwardly as shown in Fig. 5 or downwardlyas shown in Fig. 6, to a hollow rivet terminal Each of the rivets 31 and34: is insulated from the plate 26 and extends through relatively largeholes therein.

One set of the supports 28 are arranged as shown in Fig. l, each havinga terminal bolt 89 for the purpose'of providing a cross connectionbetween the resistance coils on one side of the plate and those on theopposite side.

By referring particularly to Figs. 1 and 3, it will be seenthatelectrical connection is established from one of the terminal members 4Odownwardly to the bus-bars 13. F ron'i-this bus-bar a circuit connectionis established through a clamping stud and a conducting strip 38arranged as shown in Fig. 5, to one of the supports 39. Securely affixedto this support is one end of a resistance conductor which is composedof a large number of coils 29 and extends from the terminal bolt 39alternatively over the supports 27 and 28, it being connected at itsopposite end to one of the supports 39 which is arranged as shown inFig. -LL. Connection. is thus established through the unit to a similarterminal on the opposite side of the plate 26 and the resistanceconductor continues in a similar manner backwardly and ends with theterminal 39 at the upper left-hand corner. This terminal is arranged asshown in Fig. (3 and establishes contact to the bus bar 12.

It is-evident that any number of units constructed in the aforesaidmanner may be secured to the bus-bars and when bolted in position areautomatically connected in multiple circuit relation. The bus-bars servenot only as current conductors but also as the sole support for theunits and constitute elements of the frame which is completed by the endmembers 10 and 11.

In order to provide for more than one heat an auxiliary bus-bar 12 (seeFig. 7) is mounted in parallelism with the bus-bar 12,' to which it issecured by studs ,51 and 52. The stud 51 extends through. both bus-barsand establishes an electrical connection between the heater unitadjacent to the terminals and the bus-bar 12. It supports, but isinsulated from, the bns-bar 12. The stud 52 is riveted or otherwisesecured to the bar 12 near the opposite end and extends through arelatively large hole in the bar 12 from which it is suitably insulated.It establishes a connection from this bar to one terminal of the middleunit 25 of the group" Supply circuit conductors (30 and 61 are .re.

spectively connected to the terminals &0 and 10 the latter being alsoconnected to the bus-bar 13. The bus-bars 12 and 12" are respectivelyconnected to the terminals 40 and 40.

The heater units 25 and 25 are connected across the bus-bars 12 and 13,and the heater I unit 25 is connected across the bus-bars 12. and 13.With the aforesaid connections, if.

line terminal i0 is connected only to tel niinal 40" the unit 25 will beenergized;- if it is connected only to terminal 40, units 25" and 25willbe energized; and if it is con nected to both 40 and 40 all these unitsWill be supplied with energy. Conductors may be connected to each of theseveral terminalsand suitable switches located at a convenient point forvarying the connections to govern the heat generated as hereinbeforesetforth. The arrangement of the casing is such. that the cover 14 mayreadily be unfastened and swung open to permit the inspection or theremoval and replacement of any of the units as desired.

Attention is directed to the fact that any of the units may be removedWithout interrupting or disturbing the electrical connectionsestablished to the remaining units. Consequently, if any of the units isdestroyed for any cause it 'doesnot interfere with the usefulness of theremaining units.

their Weight and permit the air to circulate through them. Furthermore,as indicated in Fig, 3, the heater may advantageously be provided with aheat reflector 65 which is clampedto the end member in any suitablemanner.

It is evident that numerous structural va riations may be effectedWithout departing from the spirit and scope of my invention,- and Iintend that only such limitations be imposed as are indicated inappended claims.

What I claim is:

1. A heating appliance comprising a pair of spaced elliptical endmembers, interposed parallel bus-bars secured to the end members andinsulated therefrom, and heater units comprising fiat metal platessecured to and insulated from the bus-bars in the central longitudinalplane of the appliance, supports insulated from the plates and extendinglaterally from the surfaces thereof and resistance conductors extendingin zigzag formation on each side of the plates, secured to the lateralsupports thereon and electri cally connected to the bus-bars; andremovable foot projections having square body portions adapted to bemounted near the top and bottom of the end member and to project'laterally therefrom to constitute supporting brackets for the appliance.

A lieating appliance comprising a pair of spaced end members in parallelplanes interposed parallel bus-bars, and heater units comprising flatmetal plates secured to and insulated from the bus-bars in the centrallongitudinal plane of the appliance, supports secured to and insulatedfrom the plates and extending from opposite surfaces thereof, andresistance conductors extending in a zigzag for ation on each side ofthe plate secured to ,he lateral supports thereon and electricallyconnected to the bus-bars.

3. A heating appliance comprising a pair of spaced elliptical endmembers, interposed parallel bus-bars secured to the end members andinsulated therefrom, and heater units comprising fiat metal platessecured to and insulated from the bus-bars in the central longitudinalplane of the appliance, supports insulated from the plates and extend-.cally connected to the busbars.

4. A heating appliance comprising a frame having a. pair of spaced endmembers and substantially parallel bus-bars mechanically connecting theend members, and a pinrality of heating units comprising a metal plateand resistance conductors supported on opposite sides of and insulatedfrom the 1 plate, said plate being adapted to be remov- The plates 26may be perforated to reduce ably secured and electrically connected tothe busbars. Y Y

5. A heater unit comprising a metal plate, a plurality of supportscomprising angle strips having one arm secured to the plate and one armextending outwardly from the plate, hollow rivets securing the supportsin pairs on opposite sides of the plate, and a resistance conductorcarried by the supports and extending in a zigzag path on one side ofthe plate through one of the hollow rivets to the opposite side and in azigzag path thereon.

6. A heater unit comprising a metal plate, a plurality of supportsarranged in pairs and extending laterally from opposite sides thereof, ahollow clamping means for securing the supports to the plate, andaresistance conductor mounted on the supports and extending-from one sideof the plate to the other through one of said hollow clamping means.

7. A heating appliance comprising a pair of spaced end'members, parallelbus-barsma chanigcally connecting the end members, and a plurality .ofheater units removably secured andelectrically connected to the busbars,each of said end members of the frame having removable foot projectionsadapted to be mounted near the top and near the bot tom of the endmember so as to project latorally from the appliance and constitutesupporting brackets therefor. v

8. A heater unit comprising a plate, a plurality of supports comprisingangle strips having one arm secured to the plate and one arm fashionedinto reverse hooks plate, and secured to and insulated from my hand inthe presence of two subscribing the plate by hollow insulated rivets,and 21 witnesses, this 12 day of May, 1914.

resistance conductor carried by said supporting strips and extendingthrough one WILLIAM HADAWAY 5 of the hollow rivets and on brfih sides ofthe Witnesses:

plate. F. GRAVES,

In witness whereof, I have hereunto set ETHEL COHEN.

